Heap Buffer Overflow in Image Loading Library Affecting SAIL
CVE-2026-40493

9.8CRITICAL

Key Information:

Vendor

Happyseafox

Status
Sail
Vendor
CVE Published:
18 April 2026

What is CVE-2026-40493?

The SAIL library, utilized for efficient image loading and saving, is susceptible to a heap buffer overflow due to a mismatch in pixel buffer allocation. In scenarios involving LAB mode images with a specific channel and depth configuration, the calculated bytes-per-pixel does not align with the allocation size, leading to overshooting writes. This vulnerability can permanently affect memory, granting unauthorized access or causing crashes. A patch has been made available in commit c930284445ea3ff94451ccd7a57c999eca3bc979 to rectify this issue.

Affected Version(s)

sail < c930284445ea3ff94451ccd7a57c999eca3bc979

References

https://github.com/HappySeaFox/sail/security/advisories/G...
x_refsource_CONFIRM
https://github.com/HappySeaFox/sail/commit/c930284445ea3f...
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CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.